In my 17.4, I was loading 3.6 grains of TG , my 130 cast bullet, range brass, an whatever primers I could find cheapest. A gen 4 mag and TTI 140 always ran perfect, and I even reloaded to it a few times. I ran a factory recoil assembly, tungsten GR and 13# spring, and tungsten GR and 15# spring and never had a problem.
As as far as the “limp wrist” argument goes, I have fired multiple glocks, 1911s, and other handguns with nothing more than my thumb around the back strap and my trigger finger on the trigger. None of them have failed to feed yet, and my 1911 with 45 Super ammo might have got away from me—but still fed the next round.